Agricola, Georgius, De re metallica, 1912/1950

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      <text>
        <body>
          <chap>
            <pb pagenum="341"/>
            <figure number="197"/>
            <p type="caption">
              <s>A—STRAKES. B—TANK. C—LAUNDER. D—PLUG. E—WOODEN SHOVEL.
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              F—WOODEN MALLET. G—WOODEN SHOVEL WITH SHORT HANDLE. H—THE PLUG
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              IN THE STRAKE. I—TANK PLACED UNDER THE PLUG.
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              of the loaded strake with a wooden mallet, in order that the tin-stone clinging
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              to the sides may fall off; all that has settled in it, he throws out with a
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              wooden shovel which has a short handle. </s>
              <s>Silver slags which have been
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              crushed under the stamps, also fragments of silver-lead alloy and of cakes
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              melted from pyrites, are washed in a strake of this kind.</s>
            </p>
            <p type="main">
              <s>Material of this kind is also washed while wet, in a sieve whose bottom
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              is made of woven iron wire, and this is the fourth method of washing. </s>
              <s>The
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              sieve is immersed in the water which is contained in a tub, and is violently
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              shaken. </s>
              <s>The bottom of this tub has an opening of such size that as much
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              water, together with tailings from the sieve, can flow continuously out of it as
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              water flows into it. </s>
              <s>The material which settles in the strake, a boy either
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              digs over with a three-toothed iron rake or sweeps with a wooden scrubber;
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              in this way the water carries off a great part of both sand and mud. </s>
              <s>The
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              tin-stone or metalliferous concentrates settle in the strake and are afterward
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              washed in another strake.</s>
            </p>
            <p type="main">
              <s>These are ancient methods of washing material which contains tin­
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              stone; there follow two modern methods. </s>
              <s>If the tin-stone mixed with </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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